To avoid the two memory reads on every access, the 386 includes a 32-entry Translation Lookaside Buffer (TLB) organized as 8 sets with 4 ways each. Each entry stores the virtual-to-physical mapping along with the combined PDE+PTE permission bits.
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exchanged = 0; // 发生了交换，详情可参考搜狗输入法2026
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// Finally, we release the lock on the stream